Centrifugal coolant pump

ABSTRACT

A centrifugal coolant pump, comprising a water inlet coupling flange( 1 ), an impeller ( 2 ), a volute casing ( 3 ), a bearing ( 4 ), a bearing housing ( 5 ), a transmission shaft ( 6 ), and fasteners ( 7 ). The bearing ( 4 ) is interference installed in the bearing housing ( 5 ). The transmission shaft ( 6 ) and the bearing ( 4 ) inner race are interference fitted together. The impeller ( 2 ) is interference installed on the transmission shaft ( 6 ). The water inlet coupling flange ( 1 ) and the bearing housing ( 5 ) are separately disposed on the two sides of the volute casing ( 3 ) and fixedly connected via the fasteners ( 7 ). The water inlet coupling ( 1 ) is provided with a first water inlet (A 11 ), and the volute casing ( 3 ) is provided with a second water inlet (B 12 ). The impeller ( 2 ) mates with the volute casing ( 3 ) to form an independent high-temperature flow path ( 9 ) and a low-temperature flow path ( 8 ).

BACKGROUND OF THE INVENTION

The invention relates to the hydraulic technical field, in particular to a centrifugal cooling pump.

To obtain combustion engines with low fuel consumption and high emission, the temperature of the machine body cooling liquid needs to be raised over 120° C. on one hand; on the other hand, to meet the requirements for temperature and density of intake air by using the intercooler, and the need of engine oil cooling by using the engine oil cooler, the temperature of the cooling liquid needs to be controlled below 100° C. At present, combustion engines mainly adopt single-circuit centrifugal cooling pumps, which can meet certain standard of the cooling water regarding temperature, but fail to meet the needs of different parts requiring cooling liquid of different temperatures in the cooling system of the combustion engines. To satisfy the needs of different parts requiring cooling liquid of different temperatures, the high-low temperature double-circuit cooling pump is designed.

The double-circuit cooling system may meet the needs of different parts requiring different temperatures in the cooling system; commonly there are two kinds of double-circuit cooling systems, i.e. double-pump & double-circuit system, and single-pump & double-circuit system. The double-pump & double-circuit system has two cooling pumps with complex repetition in structure, while the single-pump & double-circuit system is complex in realization of the system.

Therefore, a double-circuit cooling system that is simple in both structure and realization of the system is required.

BRIEF SUMMARY OF THE INVENTION

The invention provides a centrifugal cooling pump which comprises an intake water plate, an impeller, a spiral case, a bearing, a bearing block, a transmission shaft and a fastener; the said bearing is installed with an interference fit on the bearing block; the transmission shaft is matched with an interference fit with the inner ring of the bearing; the impeller is mounted with an interference fit on the transmission shaft; the said intake water plate and the bearing block are set respectively at the two sides of the spiral case and fixed by using a fastener; the said intake water plate is set with a first water inlet; the said spiral case is set with a second water inlet; the said impeller together with the spiral case form independent high-temperature fluid flow channel and low-temperature fluid flow channel.

Preferably, a high-temperature blade is set on one side of the said impeller corresponding to the high-temperature flow channel and a low-temperature blade is set on the other side of the impeller corresponding to the low-temperature flow channel.

Preferably, the said high-temperature blade and low-temperature blade both adopt the forward bending and sweepback form.

Preferably, the number of the high-temperature blade and low-temperature blade are six respectively.

Preferably, the said first water inlet and second water inlet both adopt water intake along axial direction of the transmission shaft.

Preferably, the said intake water plate has a straight tapered axial suction chamber, and the taper of the suction chamber is 7-11°. Preferably, the said suction chamber has the taper of 10°.

Preferably, the said spiral case still includes a first water outlet and a second water outlet; the said high-temperature flow channel corresponds to the first water outlet; the said low-temperature flow channel corresponds to the second water outlet.

Preferably, the said first water outlet and second water outlet both adopt water emission along the axial direction of the transmission shaft.

The invention has the following advantages:

1) The cooling pump of the invention has an impeller with both sides installed with a blade respectively; the impeller, together with the spiral case, forms two flow channels, i.e. one blade on one side corresponds to the high-temperature channel, and the other blade on the other side corresponds to the low-temperature channel. The said high-temperature flow channel and low-temperature flow channel split the cooling fluid to two independent and parallel cooling circuits for high-temperature fluid and low-temperature fluid respectively. Therefore, the invention adopting a double-circuit cooling system has combined the simple system of the double-pump & double-circuit system and the simple structure of the single-pump & double-circuit system. Additionally, the impeller adopts forward bending and sweepback blades, in realization of high efficiency. Meanwhile, the water inlets of the intake water plate and the spiral case adopt the tapered suction chamber structure, which can promote the cavitation performance of the pump and is benign to balancing axial forces of the pump.

2) The invention adopts high-low temperature double-circuit cooling pump, which can meet the needs of promoting the temperature-balancing ability of the engine and thermal transmission efficiency, realize satisfaction of different cooling liquid to different parts of combustion engines, reduce the emission index of combustion engine, increase the efficiency of the whole machine and reduce the fuel consumption.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is the diagrammatic side view of the centrifugal cooling pump of the invention;

FIG. 2 is the cutaway view along AA′ line in FIG. 1;

FIG. 3 is the top view of the high-temperature blade side of the impeller of the centrifugal cooling pump shown in FIG. 1;

FIG. 4 is the cross sectional view along BB′ line in FIG. 3;

FIG. 5 is the top view of the low-temperature blade side of the impeller of the centrifugal cooling pump shown in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

The invention is further described in combination with the drawings attached.

As shown in FIGS. 1 and 2, the invention provides a centrifugal cooling pump, including an intake water plate 1, the impeller 2, the spiral case 3, the bearing 4, the bearing block 5, the transmission shaft 6, and the fastener 7. The said bearing 4 is installed with an interference fit on the bearing block 5; the transmission shaft 6 is matched with an interference fit with the inner ring of the bearing 4; the transmission shaft 6 is connected with an interference fit to the impeller 2; the said intake water plate 1 and the bearing block 5 are set respectively at the two sides of the spiral case 3; the said intake water plate 1, the bearing block 5 and the spiral case 3 are connected by using the fastener 7; the said intake water plate 1 is set with a first water inlet A11. Preferably, the said intake water plate 1 has a straight tapered axial suction chamber 10; the straight tampered axial suction chamber 10 has the tap α of 7-11° and preferably 10°; the said spiral case 3 is set with a water inlet B12. Preferably, the said water inlets A11 and B12 both adopt water intake along the axial direction of the transmission shaft 6. The said impeller 2, together with the spiral case 3, forms two independent flow channels, i.e. the high-temperature flow channel 9 and the low-temperature flow channel 8 shown in FIG. 2. The said high-temperature flow channel 9 corresponds to the water outlet 11 of the spiral case 3, and the said low-temperature flow channel 8 corresponds to the water outlet 12 of the spiral case 3. Preferably, the said water outlet 11 and water outlet 12 both adopts water emission along axial direction of the transmission shaft 6.

A preferred embodiment of impeller 2 of the centrifugal cooling pump of the invention is described in combination with FIGS. 3-5 as follows. FIG. 3 shows the plan of the high-temperature blade 13 side of the impeller 2; FIG. 4 shows the cross sectional view along BB′ line in FIG. 3; FIG. 5 shows the plan of the low-temperature blade 16 side of the impeller 2. The said impeller 2 includes the wheel disc 14, the wheel hub 15, the high-temperature blade 13 at one side of the wheel disc and the low-temperature blade 16 at the other side of the wheel disc. In a preferred embodiment, the said high-temperature blade 13 and the low-temperature blade 16 both adopt the forward bending and sweepback form. In a preferred embodiment, there are 6 pieces of the said high-temperature blade 13 and the low-temperature blade 16 respectively. In a preferred embodiment, the diameter d1 of the water inlet at the side of the said high-temperature blade 13 is 58 mm, the diameter d2 of the water inlet at the side of the low-temperature blade is 44 mm, the diameter d3 of axle hole is 18 mm, and the diameter of the wheel hub 15 is 24 mm. The blade angle θ₁ at the inlet is 36°, the inlet height h1 is 17 mm, the blade thickness s is 3.5 mm, the blade angle θ₂ is 45°, the blade outlet height h2 is 10.3 mm, the external diameter d4 of the high-temperature impeller is 107 mm, the external diameter d5 of the low-temperature impeller is 105 mm. Technicians of the field shall understand that for different combustion engines, the pump of the invention may have the dimensions different from what is described as above.

Working Process

The pump feeds water through the water inlet A11 on the intake water plate 1 and the water inlet B12 on the spiral case 3; the transmission shaft 6 of the pump is connected to external power for drive; the impeller 2 is connected with an interference fit with the transmission shaft 6; the screw of impeller 2 throws water coming from the water inlet into the high-temperature flow channel and low-temperature flow channel respectively and then water comes out along axial direction of the pump from the water outlet 11 and water outlet 12.

Obviously, the above embodiments of the invention are only for clear description of the invention, but not to restrict the protection scope of the invention. It shall be understood that regular technicians of the field may make changes or alterations in different forms based on the foregoing description, as embodiments of the invention cannot be exhausted here. Any change or alteration that can be obviously derived from the technical plan of the invention shall be also protected as a part of the invention. 

1. A centrifugal cooling pump, including an intake water plate (1), an impeller (2), a spiral case (3), a bearing (4), a bearing block (5), a transmission shaft (6) and a fastener (7); the said bearing (4) is installed with an interference fit on the bearing block (5); the transmission shaft (6) is matched with an interference fit with the inner ring of the bearing (4); the impeller (2) is mounted with an interference fit on the transmission shaft (6); the said intake water plate (1) and the bearing block (5) are set respectively at the two sides of the spiral case (3) and fixed by using the fastener (7); the said intake water plate (1) is set with a first water inlet (A11); the said spiral case (3) is set with a second water inlet (B12); the said impeller (2) together with the spiral case (3) form independent high-temperature fluid flow channel (9) and low-temperature fluid flow channel (8).
 2. According to the centrifugal cooling pump described in claim 1, one side of the impeller (2) is set with a high-temperature blade (13) corresponding to the high-temperature flow channel (9), and the other side is set with a low-temperature blade (16) corresponding to the low-temperature channel (8).
 3. According to the centrifugal cooling pump described in claim 2, the high-temperature blade (13) and the low-temperature blade (16) both adopt the forward bending and sweepback form.
 4. According to the centrifugal cooling pump described in claim 2 or claim 3, there are 6 pieces of the said high-temperature blade (13) and the low-temperature blade (16) respectively.
 5. According to the centrifugal cooling pump described in any of claim 1, the said first water inlet (A11) and second water inlet (B12) both adopt intake water along the axial direction of the transmission shaft.
 6. According to the centrifugal cooling pump described in any of claim 1, the said intake water plate (1) has a straight tapered axial suction chamber with the taper of 7-11°.
 7. According to the centrifugal cooling pump described in claim 6, the taper of the said suction chamber is 10°.
 8. According to the centrifugal cooling pump described in any of claim 1, the said spiral case (3) still includes a first water outlet (11) and second water outlet (12); the said high-temperature flow channel (9) corresponds to the first water outlet (11), and the said low-temperature channel (8) corresponds to the second water outlet (12).
 9. According to the centrifugal cooling pump described in claim 8, the said first water outlet (11) and second water outlet (12) both adopt water emission along the axial direction of the transmission shaft. 